EP0516915A1 - Piston filling device for a writing implement, especially for a fountain pen - Google Patents

Abstract

In order to improve a piston filling device for a writing implement, especially for a fountain pen (10), which device has a reservoir (48) with a visual area (11a), an ink conducting system (20) which is arranged in the region of a gripping piece (18), a receiver (21) for a writing tip, in particular a nib (22), a shaft (15) which is arranged with a portion (15a) engaging over a bearing portion (14) of the reservoir (48), and a rotary end (26) arranged rotatably on the shaft (15) for actuating the piston filling device, in such a way that the construction is just as simple as it is reliable in operation, and that in a writing implement a number of different gripping pieces and/or shaft designs can be used, it is proposed that a visual part (11) be provided which encloses the reservoir (48) with the visual area (11a) and the bearing portion (14) for the shaft (15) and a bearing portion (16) for the gripping piece (18) with a space (19) arranged on the inside for receiving the ink conducting system (20) and for the receiver (21) of the nib (22), and that the visual part (11) be of integral construction. <IMAGE>

Description

The invention relates to a piston filling system for a writing instrument, in particular for a fountain pen, which has a tank space with a viewing area, an ink guide system which is arranged in the area of a handle, a receptacle for a writing tip, in particular a nib, a shaft which is provided with a Section is arranged to overlap a support section of the tank space, and has a swivel base rotatably arranged on the shaft for actuating the piston filling system.

Piston filling systems or fountain pen configurations in which a visible area has been created in the shaft part or in the visible part, for example through the partial use of transparent material, have long been known.

From FR-PS 823 674 a fountain pen is already known, in which it is provided that an integral part forms the tank space with the viewing area. The part is then screwed onto this part on one end with the piston filling system which can be actuated via a swivel base, while the sleeve-like part has an internal thread at its other end, into which an insertion section of the handle piece containing the ink guidance system can be screwed. This results in a piston space in which the ink is in front of the ink guide up to the end stop of the piston, and a writing tip is used as a foreign part.

Leakages can occur between the piston chamber with the integrated visible part and the writing tip, namely the fountain pen tip with ink guide and the writing pen. If the tip is put on or attached as a foreign part, the problem of leakage arises and only plastic tips can be used.

The basic structure of a piston filling system for the tank space of a writing instrument is known from DE-OS 38 26 691. Here a piston filling system for an ink writing device is proposed, in which a separately attached writing tip is used.

An anti-rotation device for the piston-bearing spindle of a piston filling system in the form of a bush arranged in the fountain pen shaft, which has a non-circular opening for guiding the spindle and is provided with a tooth profile at its lower end, is known from DE-GM 18 80 659.

It is therefore an object of the present invention to improve a piston filling system of the type mentioned in such a way that the structure is designed to be as simple as it is reliable and that a number of different, different grips and / or shaft designs can be used in a writing instrument.

This object is achieved in a piston filling system of the type mentioned by the features characterized in claim 1.

With this configuration, it is advantageously achieved that the entire ink-fillable space, including the receptacle, in particular the sleeve, is in one piece for the ink regulator as the ink guide system and the writing tip.

A major advantage of this new design is that the visible part, which includes the tank space, the visible area, the space for accommodating the ink-guiding system and the pen, is designed in one piece and no leaks due to glue points or welds etc. can occur due to this construction. In contrast to the known embodiments, the writing tip is no longer used as a foreign part, and the use of writing tips and grips made of any materials is possible.

Overall, with the configuration according to the invention, a one-piece design of the ink-carrying space or area of a writing instrument has been created, as a result of which there are no problems with regard to leaks, sticking, etc.

Furthermore, the one-piece design of the visible part offers the advantage that handle pieces of different materials can be placed in the grip area without influencing the technology of the ink guidance system. This is not possible with the known piston filling systems, especially when these materials are attacked by ink, namely metal, wood and essentially all non-plastics.

Another advantage of the one-piece design of the visible part is that there are the same advantages for the shaft as for the handle, namely that, for example, shafts made of metal or other "non-plastic" materials can be used without the ink in Piston space can attack this material or can be permanently influenced by this other material. The one-piece design of the visible part therefore gives rise to great variation possibilities or the outer shape of a writing instrument provided with this piston filling system. The piston filling system is used on a large number of writing instruments with an ink regulator at the front and a writing tip, e.g. Roller, fine line or the like. possible.

To form a simple plug-in connection of the swivel base with the shaft, it is provided that the swivel base is inserted into the shaft with an insertion section and is rotatably mounted there for actuating the piston filling system.

It is advantageously provided that the swivel base, which is designed as a cylindrical piece and has the narrower plug-in section which can be inserted into the shaft interior and a wider one with a radial surface which can be placed on a radial end surface of the shaft, is arranged on the cylinder-like shaft which is open at both ends Has rotary section.

In order to enable axial fixing of the swivel base on the shaft, it is advantageously provided that the free end of the plug-in section is formed with an annular bead with which a step-shaped, radially circumferential shoulder can be snapped behind in the interior of the shaft, the swivel base being rotatable relative to the shaft but axially fixed when the shoulder is engaged by the bead. In principle, the design of the bulge and of the recessed shoulder does not matter, because a different design can also be provided here, for example in the form of individual projecting sections on the insertion section, which engage in corresponding recesses in the interior of the shaft, it being necessary to ensure that the elements of the insertion section engage in the corresponding recesses of the shaft so that they snap into place and hold the insertion section and thus the swivel base rotatably but axially fixed relative to the shaft. Here, for example, an embodiment in the form of several hemispherical elevations which engage in an annular groove is also conceivable in order to create such a latching.

In order to enable and facilitate the engagement, it is advantageously provided that the insertion section is provided with at least one longitudinal slot running in the longitudinal direction of the insertion section.

Furthermore, it is preferably provided that a cylindrical nut sleeve can be introduced into the shaft, which has a nut thread on its inner wall surface and which can be inserted at least with one insertion section into the insertion section of the rotating foot, the outer diameter of the insertion section roughly corresponding to the inner diameter of the insertion section of the rotating foot corresponds.

The design of the swivel base and the latching in the shaft in connection with the nut sleeve offers the advantages over known systems that the assembly is considerably simplified, that fewer parts are required and that optimal functional reliability is guaranteed. The fact that the swivel base has the annular bead on its insertion section in the front area, which engages behind the annular undercut in the shaft during assembly, creates a rotatable connection. It can be provided that the insertion section is provided with two longitudinal slots in the region of the latching element, so that two resilient halves are formed. As a result, the insertion section of the swivel base can be snapped into the shaft even more easily and can also be easily dismantled. However, after inserting the nut sleeve, the insertion portion of the swivel foot is locked by the outer diameter of the nut sleeve, so that the swivel foot can be loosened or popped out, e.g. when actuating the filling mechanism is prevented.

This design gives a very significant advantage over the known systems, which consists in the fact that this simple plug-in connection of the rotating foot, which acts on the inner piston mechanism, provides the functional sequence of the mechanism in every assembly position. In other, already known piston fountain pens, the rotating foot runs in a separate thread in the opposite direction to the thread run of the piston spindle inside. And if both thread sequences are not precisely graduated in the turning path, the piston stroke inside is not correct. It can happen, for example, that the swivel base in the rear Area is unscrewed from its guide thread before the piston hits the inside of the front area of the piston chamber. In the opposite case, it may be possible that the swivel base in its guide thread is already at the end stop before the piston inside has already reached its maximum, which would lead to a lower ink absorption volume.

To form the filling mechanism, in particular for a fountain pen, it is provided that a spindle is arranged in the nut sleeve, which at one end axially fixedly carries the piston arranged in the tank space of the visible part. At the end of the visible part facing the swivel base there is advantageously a toothing, preferably in the form of a tooth edge with triangular teeth, into which a correspondingly designed toothing, preferably also in the form of a tooth edge with triangular teeth of an anti-rotation part, engages, the anti-rotation as Cylinder sleeve is formed, in which the spindle carrying the piston at its end facing away from the swivel base is axially displaceable but non-rotatably mounted. For this purpose, the spindle is flattened on at least one, but preferably on two opposite sides, and the cylinder sleeve is provided with a corresponding cross-section as an anti-rotation device, so that the spindle is held against rotation by the anti-rotation device when the rotating foot is turned. The piston with the spindle is moved by turning the swivel base, since tooth-like extensions are arranged at the free end of the insertion section of the nut sleeve, which extend into a corresponding tooth profile in the interior of the swivel base Production of a rotationally fixed connection between the swivel base and the nut sleeve is engaging and a forward or backward movement is transmitted from the internal thread of the nut sleeve to the spindle provided with a corresponding external thread and axially supported on the swivel base on one end, so that the piston inside the tank space of the visible part is transferred into a corresponding forward or backward movement is offset. The medium, for example ink, is sucked in by the backward movement of the piston after immersing the ink guide system in a corresponding storage container in the tank space, with the nut sleeve being supported axially on the visible part via the anti-rotation part during a backward movement. A flattening of the spindle is known per se, but new and particularly advantageous in connection with the one-piece visible part is the jagged edge connection between the anti-rotation part and the visible part.

The shaft that is to be attached to the visible part can optionally be provided with an internal thread and screwed onto an external thread attached to the visible part behind the viewing window, if necessary with the addition of adhesive or for materials in which an internal thread in this form only is difficult to manufacture, e.g. a wooden shaft, this can also be glued over the inner surfaces to the outer surfaces of the inner body in the piston chamber area.

With two similar plastic materials, ultrasonic welding is advantageously also possible.

So that when the fountain pen is immersed in an inkwell for filling, the ink does not result from the capillary action in the space between the inside of the handle and the outside of the visible part of the ink, which then crawls out at the end of the handle to the visible part of the viewing window, a rubber ring is attached to the inside for sealing. This is an additional safety measure if the adhesive applied when the handle is punctured should not be closed moisture-tight all around.

A connection and configuration has therefore been created in such a way that the locking of the swivel base in the shaft enters into a rotatable connection and is secured against disengagement via the nut sleeve. Advantageous refinements and developments of the invention are characterized in the subclaims.

Fig. 1

in einer schematischen Darstellung in einem senkrechten Schnitt ein Kolbenfüllsystem in einem Füllhalter, und

Fig. 2 und 3

in einer Seitenansicht und in einer Ansicht von unten (gemäß Pfeil III) einen Drehfuß bei einem Kolbenfüllsystem gemäß Figur 1.

An embodiment of the invention is explained below with reference to the drawing. Show it

Fig . 1

in a schematic representation in a vertical section, a piston filling system in a fountain pen, and

Fig . 2 and 3

in a side view and in a view from below (according to arrow III) a swivel base in a piston filling system according to FIG. 1.

In Figure 1, a fountain pen 10 is equipped with a refillable tank-piston system as a writing instrument and has an essentially cylindrical, graduated viewing part 11 with a viewing area designed as a viewing window 11a, which consists of a with the Viewing window 11a consists of a main part 13 forming part of the outer surface 12, each with narrower stepped further sections arranged at one end of the main part 13. A first support section 14 of the visible part 11, which is arranged on one side of the main part 13, supports the shaft part 15, which is pushed onto it with a section 15a and covers the support section 14, while the second support section 16 is formed on the opposite side on the main part 13 its outer surface 17 carries the grip 18 and in the interior 19 the ink guide system 20, a receptacle 21 for a spring 22 being formed on the ink guide system 20. In the interior 23 of the main part 13 and the first section 14 of the visible part 11, the tank space 48 is formed, which has a connection 24 to the ink guide system 20.

To form the piston filling system, the shaft part 15, referred to below as the shaft, is provided at its free end 25, not pushed onto the visible part 11, with a rotating foot 26, which is designed as a cylindrical piece and consists of an insertion section 28 that can be inserted into the interior 27 of the shaft 15 and one for the operation of the piston filling system provided rotary section 29. The insertion section 28 is narrower and the cross section of the interior 27 of the shaft 15 is designed for insertion, while the wider rotary section 29 is equal in its outer diameter or slightly smaller than the outer diameter of the shaft 15, with a radial, the Shaft 15 facing surface 30 is formed, which can be applied to a radial end surface 31 in the region of the end 25 of the shaft 15 in the assembled state.

The free end 32 of the insertion section 28 is provided with an annular bead 33, the bead 33 rises with a step-shaped transition 34 on the outer surface of the insertion section 28 and at the same time forms the end of the insertion section 28. The front region of the bead 33 has a phase 35 in order to facilitate the insertion of the insertion section 28 into the interior 27 of the shaft 15. On the inner surface 36 of the shaft interior 27, a step-shaped shoulder 37 is formed in the form of a recess which can be gripped behind by the bead 33 with the step-shaped transition 34 such that the bead 33 engages behind the shoulder 37 in the shaft interior 27.

In order to facilitate the insertion of the plug-in section 28 into the interior 27 of the shaft 15, the plug-in section 28 has two longitudinal slots 38, so that two mutually resilient parts 28a, 28b result which enable the plug-in section 28 to be inserted without problems.

To secure the insertion section 28 of the swivel base 26, a cylindrical nut sleeve 39 is inserted into the shaft 15, which has an internal thread 41 on its inner wall surface 40, an insertion section 42 of the nut sleeve 39 being insertable into the interior 43 of the swivel base. The outside diameter DA1 of the insertion cutout 42 corresponds to the inside diameter DI1 of the insertion section 28, the insertion section 42 extending into the region of the bead 33 of the insertion section 28, so that the bead 33 locks behind the shoulder 37 of the shaft 15. The nut sleeve 39 has a guide section 42b adjoining the insertion section 42a, the outside diameter DA2 of which corresponds to the inside diameter DI2 of the shaft 15, so that the nut sleeve is rotatably guided in the shaft 15. Since the insertion section 42a is connected in a rotationally fixed manner to the rotating foot 26, the nut sleeve 39 can be rotated in the shaft 15, but via the Swivel base 26 held axially immovable. In the internal thread 41 of the nut sleeve 39, a spindle 44 is screwed with an external thread 45, which carries at its end 46 remote from the swivel base 26 a piston 47, the cross section of which can be correspondingly displaced in the tank space 48 formed by the main part 13 and the first section 14 .

Arranged in the shaft 15 is an anti-rotation part 49 whose lateral toothing 50 in the form of a toothed edge corresponds to a toothing 51 at the end 11a of the visible part 11 in the shaft 15 and holds the anti-rotation part 49 in a rotationally fixed manner. Via the axial fixation of the nut sleeve to the swivel base, which is axially fixed by the latching, the anti-rotation device, which is supported on one side via the toothing on the visible part, is also axially fixed. The anti-rotation part 49 is designed as a cylinder sleeve through which the spindle 44 is passed. Since the spindle 44 is flattened on two opposite sides and the anti-rotation part 49 has a corresponding through-opening 52 which corresponds to the outer profile of the spindle 44, the spindle is guided axially by the anti-rotation part 49 and held in a non-rotatable manner.

If the rotary foot 26 is now rotated to fill or empty the tank space 48, the rotary movement is transmitted to the nut sleeve 39, which in turn transmits the rotary movement to the external thread 45 via the internal thread 41. Since the spindle 44 is axially displaceable but non-rotatably in the shaft 15 via the anti-rotation part 49, this results in a forward or Backward movement of the spindle 44 and thus the piston 47 in the tank chamber 48 is generated. The spindle 44 is therefore secured against rotation by the anti-rotation device 49 arranged approximately at the end of the tank space 48, and at the same time a secure mounting is created by the locking of the rotating foot 26 in the shaft 15. As a result, an extremely functionally reliable piston filling system has been created which consists of a few parts.

The piston 47 is designed in such a way that it completely seals off the tank chamber 48 from the swivel base 26 and, when moving backwards, draws a liquid medium into the tank chamber 48 via the ink-guiding system 20 and the connection 24, while a corresponding forward movement introduces one into the tank chamber 48 Medium is pressed via the connection 24 to the ink guide system 20. The connection 24 is formed as a partition between the tank space 48 and the interior 19, the partition expanding a nozzle-shaped extension, which extends into the tank space 48, in which a tubular flow channel 24a for the flow of the medium between the tank space and the Interior 19, in which the ink guide system 20 is arranged, and vice versa. The ink guide system has an insertion tube 24b which extends through the flow channel 24a to the end of the nozzle.

In order to ensure the rotatability of the nut sleeve 39 with the swivel foot 26, the latter is provided in its interior 43 with a tooth profile 53 formed from a number of individual teeth or beads, into the corresponding tooth-like extensions 54 at the end of the nut sleeve 39 engage and thus lead to a non-rotatable toothing between swivel base 26 and nut sleeve 39. The end tip 44a of the spindle 44 is supported axially on the swivel base 26 (FIG. 3).

So that when the fountain pen is immersed in an inkwell (not shown in the drawing) for filling, the ink cannot migrate as a result of the capillary action in the space between the inside of the handle and the transparent body on the outside ink, which then at the end of the handle to the visible part of the Creeping out of the viewing window, it is provided that in the area of the stepped transition 13a between the main part 13 having the viewing window 11a and the section 16 of the viewing part 11 carrying the handle 18, a rubber ring 55 is arranged as a seal, the transition 13a for receiving the rubber ring 55 is rounded. The main part has an indentation 56 which extends up to the step-shaped transition 13a and shortens the viewing window 11a compared to the total length of the main part 13, into which an overlapping section 18a of the grip piece 18, which is less thick than the grip piece 18, is inserted, and thus the Transition 13a additionally holds the rubber ring 55.

The support section 16, in its transition away from the transition 13a, has a recess 16a in front of it, into which an overlapping section 18b having a greater thickness than the grip piece 18 is inserted.

The individual parts of the fountain pen are made of a suitable plastic with the exception of the metallic nib. In this case, a fully transparent or at least translucent plastic is preferably selected for the visible part, while the other parts are preferably made from introduced plastic material.

Claims (11)

Piston filling system for a writing instrument, in particular for a fountain pen (10), which has a tank space (48) with a viewing area (11a), an ink guide system (20) which is arranged in the area of a handle (18), a receptacle (21) for a writing tip , in particular a pen (22), a shaft (15), which is arranged with a section (15a) overlapping a support section (14) of the tank space (48), and a swivel base (26) rotatably arranged on the shaft (15) Actuation of the piston filling system,
characterized,
that a the tank space (48) with the viewing area (11a) and the support section (14) for the shaft (15) and a support section (16) for the handle (18) with an inside space (19) for receiving the ink supply system (20) and for receiving (21) the pen (22) comprising a visible part (11) is provided, and that the visible part (11) is formed in one piece. Piston filling system according to claim 1,
characterized,
that the sleeve-like handle (18) on the support section (16) of the visible part (11) can be pushed or screwed on the outside or can be held on by gluing. Piston filling system according to claim 2,
characterized,
that in the region of the step-shaped transition (13a) between a main part (13) having the viewing window (11a) and the supporting section (16) of the viewing part (11) carrying the handle (18), a rubber ring (55) is arranged on the outside as a seal. Piston filling system according to one of claims 1 to 3,
characterized,
that the shaft (15) can be pushed or screwed onto the supporting section (14) of the visible part (41) and can be held thereon. Piston filling system according to one of claims 1 to 4,
characterized,
that the swivel base (26) is inserted with an insertion section (28) into the shaft (15) and rotatably supported there for actuating the piston filling system. Piston filling system according to one of claims 1 to 5,
characterized,
that the swivel base (26) is arranged on the cylindrical piece-like shaft (15) which is open at its free end (25) and is designed as a cylindrical piece and has the narrower plug-in section (28) which can be inserted into the shaft interior (27) and a wider one with a radial one Surface (30) on a radial end surface (31) of the shaft to be rotated section (29). Piston filling system according to claim 6,
characterized,
that an annular bead (33) is formed at a free end (32) of the insertion section (28) with which a step-shaped, radially circumferential The shoulder (34) can be snapped behind the shaft interior (27), the swivel foot (26) being rotatable relative to the shaft (15) but axially fixed when the shoulder (34) engages behind the bead (33). Piston filling system according to claim 7,
characterized,
that the insertion section (28) is provided with at least one longitudinal slot (38) running in the longitudinal direction of the insertion section. Piston filling system according to one of claims 7 or 8,
characterized,
that a cylindrical nut sleeve (39) can be inserted into the shaft (15), which has a nut thread (41) on its inner wall surface (40) and which can be inserted into the insertion section (28) of the rotating foot (26) with at least one insertion section (42) The outer diameter (DA1) of the insertion section (42) corresponds to the inner diameter (DI1) of the insertion section (28). Piston filling system according to one of claims 1 to 9,
characterized,
that at one end (11b) of the visible part (11) a toothing (51) is formed, in which a toothing (50) of an anti-rotation part (49) engages, the anti-rotation (49) being designed as a cylinder sleeve in which one its end facing away from the swivel base carries a piston (43) axially displaceable but non-rotatably mounted. Piston filling system according to one of claims 9 or 10,
characterized,
that tooth-like extensions (54) are arranged at the free end of the insertion section (42a) of the nut sleeve (39), which extend into a corresponding tooth profile (53) in the interior (43) of the swivel base (26) for establishing a rotationally fixed connection between the swivel base (26 ) and the nut sleeve (39) are engaging.

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